VADER: Valence Aware Dictionary for Sentiment Reasoning (VADER) [1]}, is a lexicon and rule-based method designed to classify the polarity of text from social media. It uses a list of lexical features, such as words, which are labelled accordingly to their polarity. The output of VADER is based on the probability of the sentence belonging to either the positive, negative or neutral class. This method was created having as basis a set of human-curated lexicon sentiment analysis.
